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Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 8 – WATER HEATER MANAGEMENT
Page
120
of
216
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0078_0M
09/11/2015
Phone: 800-526-0288
GF-128
Table 8-2: Water Heater Management Menu Item Descriptions
WHM MENU
See section 8-6 for a range of choices and the default values.
ITEM
MENU LEVEL &
OPTION
DESCRIPTION
1
WHM Mode
This menu option enables/disables the WHM mode and sets the unit
to function as a WHM Slave or WHM Master. Set the WHM mode
option to
WHM Master
for the controlling Master and to
WHM Slave
for all other units on the Modbus network.
2
WHM Setpoint
This is the temperature (°F or °C) that each unit in the WHM system is
trying to control to.
3
WHM Nxt On VP
(See NOTE below)
This is the Next On A/F Valve position (%) for the system. When all
enabled water heaters have a fire rate greater than this value, it is
time to enable another water heater, if one is available. This value
should always be greater than the Next Off A/F Valve, and there
should be a reasonable spread between the 2 values.
4
WHM Nxt Off VP
(See NOTE below)
This is the Next Off A/F Valve position (%) for the system. When all
enabled water heaters have a A/F Valve position less than this value,
it is time to shut down another water heater, if one is available. This
value should always be less than the Next On A/F Valve position, and
there should be a reasonable spread between the 2 values.
5
Lead/Lag Hours
This menu option is designed to spread the total number of run hours
accumulated on all units in the system so that each unit has
approximately the same number of run hours.
6
WHM Upld Timer
Sets the time between successive WHM Heartbeat OnAER data
transmissions.
7
Setpoint Setback
Enables/Disables the Setpoint Setback feature which allows for the
substitution of an alternate Setpoint setting during certain time periods
of the day. The alternate Setpoint is entered into the
Setback
Setpoint
item and the time is entered in the
Setback Start
and
Setback End
items.
8
Setback Setpoint
This menu item specifies the setpoint temperature (°F or °C) that the
WHM system will maintain during time periods of low DHW demand.
9 & 10
Setback Start:
Setback End:
These two menu items specify the start and end times that the
Setback Setpoint will be in effect. (12:00am – 11:59pm)
11
WHM Auto Mstr
Password Level 2 (6817) must be entered in order to access the
WHM Auto Mstr menu option. This item Enables (Yes) or Disables
(No) an Automatic WHM Master Switch-Over function. When enabled
(Yes) the WHM will automatically select a new Master if the current
Master fails or loses power. This option is used with the WHM Auto
Timer option, described in the following section.
12
WHM Auto Timer
Password Level 2 (6817) must be entered in order to access the
WHM Auto Timer menu option. When the WHM Auto Mstr option is
set to Yes (Enabled), the WHM Auto Timer option allows the user to
select the elapsed time interval between failure of the WHM Master
and switch-over to a new WHM Master.